Totally agree with you on a "Business" user, around town the lexus wins no doubt, BUT I like many don't drive much in town, so not so good for me.
What gets up my nose is all the "HYPE" about technology from Lexus and yet still is falls way short of "STATED" facts and figures.
Just where have these millions of pounds worth of improvement got the car from the 400h, in short NOWHERE.
LexusJohn - I understand that you have an X6 and everyone is entitled to their opinon but to say that there has been no improvement since 400h is a little unfair. To play devils advocate I have driven both X5 and X6 and yes they "out-handle" the RX450 - or to put it another way the ride comfort of the X5/X6 is absolutely woeful next to RX450 which having not even a whiff of sportiness about it is a much more relaxing drive.
As for economy it is a lot down to driving style. You claim upto 40 mpg in your X6 but Top gear are claiming 24 for the same car? What car averaged 37 mpg in RX450 in their tests? It will depend entirely on journey type and driving style. One thing I do know is the RX will switch off and save fuel in traffic but X6 won't.
If you are a business user you can't ignore the 14% BIK and as a non business user you can't ignore the congestion charging saving and less road tax.
I also prefer to be a Lexus owner rather than BMW owner - as a past owner I was never that impressed with BMWs customer service.
Anyway please don't see this as Lexus good BMW bad rant - it isn't! I just feel it is important to say that it's horses for courses. I liked the RX as it suits my driving style and I like the looks, equipment and feel of it. You seem not to - great. Just be glad that we can still drive vehicles that suits our needs and wants still in this day and age.....